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BER vs BLER vs DBLER

This page on BER vs BLER vs DBLER provides difference between BER,BLER and DBLER measurements used to test GSM/GPRS/EGPRS compliant mobile.

BER stands for Bit Error Rate measurement. It is the ratio of number of bits received in error at the receiver to the total number of bits transmitted from transmitter.

BER =(Received bits in error/Total number of send bits)

BER test provides very accurate measure of performance any system compare to BLER and DBLER tests as it checks each of the bits transmitted and compare with received bits.

BLER stands for Block Error Rate measurement. It is the receiver measurement used in conformance testing of GPRS/EGPRS mobiles. Retransmission is done for the blocks which are received in error. BLER is the ratio of received erroneous blocks to the total number of data blocks transmitted. For example, in CS4 coding scheme 400 information bits are carried in a block. BLER just provides result either OK or NOT OK for each of the blocks. It does not provide any information on number of errored bits in a data block.

BER vs BLER vs DBLER

DBLER stands for Data Block Error Rate measurement.

DBLER = (Received data blocks in error/Total number of transmitted blocks)

With DBLER test, only the data bits are analyzed, while in BLER test block header and USF flags are analyzed too. Both are almost the same test. DBLER does not take into account all the bits resulted into block error. These tests are performed in test mode B. Refer page on Test Mode A vs Test Mode B used in GPRS/EGPRS mobile testing.

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